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360° = 40° + 25° + 15° + bacaan
360° = 80° + bacaan
bacaan = 360° - 80° = 280°
jumlah buku bacaan =
280 / 360 × 1800 = 1400 buah
semoga membantu ^^!
=360°-80°
=280°
Jumlah buku bacaan=280°/360°×1800=1400